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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 13 Abstracts search results
Document:
SP321-07
Date:
September 29, 2017
Author(s):
Mario Glikman, Gabriel Polo, Oguzhan Bayrak, and Trevor D. Hrynyk
Publication:
Symposium Papers
Volume:
321
Abstract:
The performance of slab-column connections has been critically studied over the last several decades by researchers aiming to better understand the behavior of flat slabs subjected to punching shear loading conditions. As a result, the use of slab shear reinforcement has emerged as a practical strategy to improve both the strength and ductility of reinforced concrete flat slabs. The primary objective of this research study was to investigate the behavior of reinforced concrete slab-column connections employing an inclined shear reinforcement system comprised of deformed steel reinforcing bars. Results are presented from an experimental program conducted at the Ferguson Structural Engineering Laboratory of The University of Texas at Austin. The tests were aimed at establishing the merits and limitations of the shear reinforcement system, and it was found that a premature failure attributed to inadequate shear reinforcement anchorage controlled the performance of the strengthened slabs. The performance of the slabs constructed with the inclined reinforcement system is compared to that of slabs reinforced with more conventional, vertically-oriented, shear reinforcement. Lastly, the influence of the observed anchorage-driven failures were examined in the context of estimated slab shear resistances developed from provisions and analysis methods currently available for reinforced concrete flat slabs.
The performance of slab-column connections has been critically studied over the last several decades by researchers aiming to better understand the behavior of flat slabs subjected to punching shear loading conditions. As a result, the use of slab shear reinforcement has emerged as a practical strategy to improve both the strength and ductility of reinforced concrete flat slabs.
The primary objective of this research study was to investigate the behavior of reinforced concrete slab-column connections employing an inclined shear reinforcement system comprised of deformed steel reinforcing bars. Results are presented from an experimental program conducted at the Ferguson Structural Engineering Laboratory of The University of Texas at Austin. The tests were aimed at establishing the merits and limitations of the shear reinforcement system, and it was found that a premature failure attributed to inadequate shear reinforcement anchorage controlled the performance of the strengthened slabs. The performance of the slabs constructed with the inclined reinforcement system is compared to that of slabs reinforced with more conventional, vertically-oriented, shear reinforcement. Lastly, the influence of the observed anchorage-driven failures were examined in the context of estimated slab shear resistances developed from provisions and analysis methods currently available for reinforced concrete flat slabs.
DOI:
10.14359/51701194
SP321-10
Walter H. Dilger
Inclined shear reinforcement affects the response to shear in reinforced and prestressed concrete members in two ways: it increases the capacity to resist shear and reduces the width of the shear cracks. The increase in shear resistance is the result of the decrease in the compressive stress in the diagonal compression struts – theoretically up to fifty percent - relative to beams with vertical stirrups. The reduction in crack width stems from the interception of the inclined shear cracks by the stirrups approximately at right angle. Associated with the reduced compressive stress in the concrete struts and the smaller crack widths is a reduction in shear deformation, which can be important for heavily loaded transfer girders or deep beams. For the understanding of the internal mechanism in concrete members with inclined shear reinforcement the paper first presents theoretical aspects for beams and relevant experimental verification from the literature, which confirm the above statements. This is followed by evidence from recent tests on punching shear in two-way slabs that the use of inclined headed stud shear reinforcement (HSSR) also increases the punching capacity of slabs.
10.14359/51701199
SP321-09
Johannes Furche, Carsten Siburg, and Ulrich Bauermeister
Lattice girders consist of longitudinal reinforcing bars which are connected to vertical or inclined struts by welding. Due to the great stiffness of the anchorage of the struts, this kind of reinforcement works well as shear reinforcement also in two way span flat slabs. The experience with different kinds of girders as punching shear reinforcement led to an optimized girder shape. This highly effective girder was tested in full scale tests to obtain a European Technical Approval based on the European design code Eurocode 2. These tests are described in this paper. The results are evaluated according to the American design rules of ACI 318-14 too. The punching shear resistance of slabs with this special lattice punching shear reinforcement is compared with the resistance when using other reinforcement.
10.14359/51701197
SP321-12
David A. Fanella, Mustafa Mahamid, and Michael Mota
Voided concrete flat plate slab systems, which have been used for many years in Europe and other parts of the world, are becoming increasingly popular in the U.S. because of many inherent benefits. This paper presents information on these benefits as well as requirements for serviceability, flexure, and shear. Also included are discussions on vibration and fire resistance.
10.14359/51701202
SP321-11
Amin Ghali and Ramez B. Gayed
Assemblies of vertical headed stud shear reinforcement are extensively used in practice to resist punching of concrete slabs. Similarly, headed studs making an angle 45 degrees with slab surface can be used for the same purpose. Equations for design and detailing are presented with examples.
10.14359/51701201
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